Update document

doc/api/auth/status.json

@@ -0,0 +1,13 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema",
+    "$id": "https://github.com/lifegpc/pixiv_downloader/raw/master/doc/api/auth/status.json",
+    "title": "服务器验证状态",
+    "type": "object",
+    "properties": {
+        "has_root_user": {
+            "type": "boolean",
+            "description": "Whether to have the root user, if not, the authentication is not needed when adding new user."
+        }
+    },
+    "required": ["has_root_user"]
+}